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jcos: fighting talk safe in the knowlegde that no harm can come of it. Typical of internet warriors Brave talk with nothing behind it.
He threatened to beat him up but it was all jcos. The guy lived 2000 miles away
by Mark McKernan June 29, 2005
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JCO (Just Come Over) is a term used to define immigrants

It can be very hurtful and insulting if they know what it means
Cool kid: "Fuck you, JCO!"
JCO: "I only came to steal your health care!"
by simpsonzerox May 01, 2010
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